ECE 223 Electronic Measurements: Chapter 1 Digital Oscilloscope

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Questions and Answers

What is the function of an oscilloscope?

To generate time-dependent electrical signals
To measure and analyze waveforms in electrical circuits (correct)
To display frequency-dependent electrical signals
To control the voltage in electronic circuits

Which type of oscilloscope is known for displaying time-dependent electrical signals on a cathode ray tube screen?

Digital phosphor oscilloscope
Digital storage oscilloscope
Digital sampling oscilloscope
Analogue oscilloscope (correct)

What determines the position of the bright spot on the screen of a cathode ray tube in an oscilloscope?

Two voltage signals (correct)
Amplitude of the signal
Frequency of the signal
Wavelength of the signal

Which type of oscilloscope is known for its ability to capture and store waveforms for later analysis?

Digital storage oscilloscope (A) Signup and view all the answers

What does CRO stand for in the context of oscilloscopes?

Cathode Ray Oscilloscope (A) Signup and view all the answers

What component of a CRO is responsible for producing trigger pulses to start the horizontal sweep?

Trigger Circuit (D) Signup and view all the answers

Which block of a CRO is responsible for amplifying the signal waveform to be viewed?

Vertical Amplifier (B) Signup and view all the answers

What purpose does the delay line serve in a CRO's vertical amplifier?

To delay the vertical signal enough to keep it from reaching the CRT deflection plates before the horizontal sweep circuits are running (A) Signup and view all the answers

What does the horizontal amplifier of a CRO do with the sawtooth voltage it receives?

It applies it to the horizontal deflection plate (A) Signup and view all the answers

In a CRO, what is responsible for generating the electron beam and accelerating it to a high velocity?

Cathode ray tube (C) Signup and view all the answers

What is the ideal output resistance of an ideal op-amp model?

Ro = 0 (C) Signup and view all the answers

What is the characteristic of the ideal op-amp model in terms of input resistance?

Ri = ∞ (A) Signup and view all the answers

What is the ideal open loop gain of an ideal op-amp model?

A → ∞ (D) Signup and view all the answers

Which terminals of the op-amp are input terminals in the ideal op-amp model?

Terminals 2 and 3 (A) Signup and view all the answers

What is the main characteristic of the negative feedback configuration of an operational amplifier?

Limited closed loop gain and used in linear applications (C) Signup and view all the answers

Which terminals of the op-amp are connected to positive and negative voltages in the practical op-amp model?

Terminals 7 and 4 (A) Signup and view all the answers

What is the purpose of an op-amp comparator in an inverting configuration?

To compare voltage magnitudes of two inputs (A) Signup and view all the answers

How can bistability be obtained in a multivibrator circuit?

By connecting a dc amplifier in a positive-feedback loop with loop gain greater than unity (B) Signup and view all the answers

What is the characteristic of a bistable multivibrator?

Has two stable states and moves to the other stable state when triggered (A) Signup and view all the answers

What determines whether the output voltage of an op-amp comparator will be at +Vcc or -Vcc?

The connection of the input signal to the inverting or noninverting terminal (D) Signup and view all the answers

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Study Notes

Oscilloscope Functions and Types

Displays time-dependent electrical signals for analysis.
The Cathode Ray Oscilloscope (CRO) utilizes a cathode ray tube (CRT) screen for visual representation of signals.
Electronic components control the positioning of the bright spot on the CRT screen to represent signal amplitude over time.
Digital storage oscilloscopes (DSOs) can capture and store waveforms for later analysis.

CRO Components and Functions

CRO stands for Cathode Ray Oscilloscope.
The trigger circuit in a CRO generates pulses to initiate the horizontal sweep across the screen.
The vertical amplifier amplifies the input signal waveform, making it visible on the screen.
A delay line in the vertical amplifier allows for better timing and synchronization of signal display.
The horizontal amplifier processes sawtooth voltage to drive the horizontal beam movement on the CRT.

Electron Beam Generation and Op-Amp Characteristics

An electron gun within the CRO generates the electron beam and accelerates it for high-speed observation.
An ideal op-amp has an infinite input resistance, helping to minimize loading effects.
The ideal open-loop gain of an op-amp model is considered infinite, providing strong amplification without feedback.
In an ideal op-amp, the inverting and non-inverting terminals serve as input terminals.

Feedback and Comparators in Op-Amps

The negative feedback configuration stabilizes the gain and enhances linearity of an operational amplifier.
In practical op-amps, the positive voltage is connected to the non-inverting terminal, while the inverting terminal is linked to the negative voltage source.
An op-amp comparator in an inverting configuration outputs a high or low state based on voltage comparisons.
Bistability in a multivibrator circuit can be achieved through a feedback mechanism that creates stable high and low states.

Output Characteristics of Op-Amps

The output voltage of an op-amp comparator will be at +Vcc if the non-inverting input exceeds the inverting input; otherwise, it will be at -Vcc.

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